What is a diffusor ?
If you have an room with unpleasing audio properties, one possibly reasons can be echos that occur in a structured way. Early echos (e.g. <0.4 sec) are e.g. well known for inhibiting personal speaking comfort.
Now to get rid of echos, there are two practical ways: sound absorbers and sound diffusors.
The goal of a good diffusor is to scatter sound, so that a specific incoming sound goes to all possible output directions. Hence echos are quite "mute" and do not start at a precise time, but one hears a slow buildup and decrease of echo noise.
Audio absorbers create a harsh empty environment, similar to speaking in open air, while diffusors create a "warm" and sound of a well stocked living room.
Mainly, there exist one and two-dimensional variants, and a you will find heaps of information in the references. And, they are extremely common in recording studios.
Where do you want to put your diffusor ?On the sides and above the "viewing direction" to the sound source. In your rear, sound absorbers are a better choice.
Building a diffusor
Usually, diffusors are made from wood. The material should be reasonably stiff, so sound does not deform it. Ideally, the material should not burn, which sadly, PLA and ABS do. So, please be aware that a room with diffusors is a possible deathtrap.
I figured that these diffusors can be printed easily with 3d printers, although the printsize requires to join many pieces to obtain a large enough area to actually effect the room sound. For a minimal effect, you want a couple of square meter (>25 prints).
Cost Analysis
I found one offer where 6 pieces of 0.6*0.6 mm diffusor cost 370 E. Thats 170 E per square meter.
If you 3d print it with the octagonal structure, you will need 5kg of filament per square meter. Thats in a similar price regime. If you print for material costs. Also, you need to print for 16 days for a square meter on my printer...
The files
All files are created using openscad, the stls are just examples, and its highly recommended that you do not reuse a single part in a panel, but each part should be different. Also, you want to set the wall thickness according to your 3d printers nozzle.
2d rectangular diffusor. It has sideholes, to mount the pieces together. It is suited for 3d printing, but takes quite a while.
Hexagonal diffusor. I figured that instead of a recitlinear grid, the diffusor cells can be aligned in a hexagonal layout. Really neat, no? However, you need to play with your slicing software, so that the outside walls actually print.
Manhatten 1d diffusor, which prints quickest, but only diffuses in one direction. The figer structure might be to small, you might want to increase the cell size to 20mm, for even faster printing.
Reference:
The videos linked here are also shown above. They are not from me, and I just wanted to link them for further information for the reader.
http://en.wikipedia.org/wiki/Diffusion_%28acoustics%29
http://www.youtube.com/watch?v=qFeM2uWuMZI
http://www.youtube.com/watch?v=FOjHsexNBTQ
http://arqen.com/sound-diffusers/http://www.mh-audio.nl/diffusor.asp
Ask questions in our forums.
Learn how to strings the towers here.
Learn how to calibrate the towers here.
Learn how to properly calibrate the Ramps 1.4 pots here.
The Rostock BI V1.0 was sold at Boots Industries in fully assembled and kit form.
Our popular version of the Rostock printer by Johann features a cable drive and several other key modifications/improvements.
All parts shown were printed using our Super Premium PLA Filament.
Comes with everything you need to build your own or improve upon the design:
All Sketchup models, ready to print stl trays and additional exploded view models and pictures.
Don't hesitate to contact us if you want help with your build!
Quick specs:
- Printer Dimensions (LxWxH): 380 mm X 330 mm X 580 mm
- Build Volume (cylindrical): 170 mm Diameter X 155 mm Height
- Maximum Operating / Printing Speed: 200 mm/s
- Minimum Layer-height: 100 Microns (0.10 mm)
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| Alu frame Adapto printer |
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| Wooden frame Adapto 3d printer |
200x240x280mm print volume!!
To download the parts see GitHub: http://bit.ly/11VXWYF Contains parts for both 8mm and 10mm smooth rods + +
For some build guidees see RepRap Wiki: http://bit.ly/12dyT3b
This V1.0 have a lot of updated parts for the Adapto V 0.1.1
The thought behind the Adapto 3D printer is that one can use the same printed parts on printers with different types of materials(in the frame).
The history behind this design is that i got hold of some alu extrusions that was intended to be used on a MendelMax
During the MM build i got so extremely annoyed with how over engineered it is and the blind joints so I decided to tear the MM apart in favor to make a design that only used 50% of the MM extrusions(that means i now have enough extrusions for 2 printers :D ).
I also designed the parts in a way that makes the builder able to use either Alu extrusions (20x20mm), wood, alu, acryl plates or plates made out of any material actually(if it is stiff enough).
I recommend not using anything thicker than 20mm thick plates/stripes(due to the y motor mount and y idler parts) and use max 34mm wide frame parts(due to the design of the feet`s), but thinner is ok if the material is stiff enough.
If you decide to build one, please feel free to add a pin on the Adapto Map
https://maps.google.com/maps/ms?msid=205564004670126753599.0004c999938430cb1f611&msa=0&ll=67.339861
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| Laser Bot hardware setup |
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| Laser Bot workflow |
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| Laser diode head |
This kit is a combination of the popular 1.7W 445nm Laser Diode Component and the 2.0 Amp matching laser driver kit with a 12V adapter. This includes everything you need to get your laser up and running in your product or project. We now even cable the laser with a Mini Fit Jr. connector at 2.5 feet to make it even easier to hook everything up! The kit includes:
1.7W 445nm Laser Diode Component (now with 2.5′ Mini Fit Jr. Connector Cable included)
2.0 Amp Adjustable Laser Diode Driver Kit, 8V Compliance
Power Adapter 12V 2A, US Style Plug
Laser Specifications:
This multi transverse mode laser diode component is pressed fit mounted in an aluminum housing and has an aluminum mountable heat-sink. The front of the component contains a glass collimating lens for the laser output.
Absolute Maximum Ratings:
Item Absolute Maximum Ratings Unit
Forward Current (Tc = 25°C) 1.7 A
Allowable Reverse Current (Tc = 25°C) 85 mA
Operating Case Temperature 50 °C
Electrical / Optical Characteristics
Item Min Typ. Max Unit
Optical Output Power 1.6 W
Dominant Wavelength 435 455 nm
Threshold Current 80 220 mA
Operating Voltage 3.7 5.5 V
Beam Divergence Full Anlge (1/e^2) // 5 14 25 deg.
Beam Divergence Full Anlge (1/e^2) – Perp 30 44 50 deg.
Driver Overview:
2 Amp Version, 12V adapter Kit
This version of the popular High Current Laser Driver offers up a lot of current in a small package for an excellent price. The design team perfected several versions of this driver to give a quality current source with a large compliance voltages with both adapter choices to be able to work with most every laser diode. They packed it with multiple features and made it capable of interfacing with even the oldest of your equipment in your lab or the newest wiz bang in your product or system. This version includes a 12V power adapter that will provide 8 volts at maximum load of 2 amps. This can be used to power higher voltage laser diodes in the 4-7 volt range like the 445nm laser diode component. It can also power IR laser diodes in the 2-4 volt range, but it might need additional cooling fan if left on for extended amounts of time.
This driver will provide 1 amp of constant regulated and protected current to the diode. Configurable current limits with jumpers for 0.5 and 1.0 amp settings and adjustable output with an analog trim pot. It also can be remotely controlled with an opto isolated input with a super huge range of acceptable voltages for turning your driver on and off. Does your equipment in your project or system that you want to interface with have backwards logic? No problem! There is a jumper for choosing inverted or non inverted logic as well! Perfect for integrating into any final product or project.
Features:
High power current source for driving Laser Diodes and Light Emitting Diodes.
Current Range of 2 Amps.
Current Ranges are adjustable in 500ma increments.
No need for extra cooling at maximum load. (depends on power adapter and compliance voltage.)
Soft start for diode protection.
Reverse diode and ESD protection.
Thermal Protection and Over Current Protection.
Compact Size.
CW Mode and Input Control Mode.
Digitally isolated control input.
Control from CW to 5KHz.
Configurable Input signal: Inverting /Non-Inverting.
Multiple connector options for both Laser/LED output and control input.
LED status lights for input laser enabled and laser on.
Optional fan for extra thermal stability.
Specifications:
Specification HCDBSA 2 AMP
Current Source Range: 0 – 2 Amps
Current Limit Jumper Settings: 0.5, 1.0, 1.5, 2.0 Amps
Compliance Voltage w/7.5V adapter: 3.5 Volts
Compliance Voltage w/12V adapter: 8 volts
Current Resolution: 0.1%
Current Adjustment: Analog Trim Pot
Current Range Accuracy Always greater than limit, no more than 15%
Laser Diode Protection: Soft Start, Reverse Voltage, Current Limit, Thermal Shutdown
AC Adapter Input Voltage: 100 – 240 VAC
Control Signal Digital Isolation Voltage: 4500 Vrms
Minimum Control Signal ”Turn On” Voltage: 2.8 Volts
Control Signal Maximum Voltage: 36 Volts
Control Signal Maximum Current: 50 ma
Control Signal Maximum Frequency: 5KHz
Connectors: Screw Terminal and Molex Mini-Fit Jr™ Connectors
Operating Temperature: 0 to 40 °C
Storage Temperature: -40 to 70 °C
Dimensions: 2.85″ x 2.1″
A modified version of the Mendel90 which uses a lasercut melamine coated MDF frame (same fixing idea as the graber i3 frame). It allows an acrylic enclosure to be fitted.
Main changes:
Frame re-designed, Z axis changed to laser cut parts.
Some plastic parts modified (not many)
Acrylic enclosure added
Wiring simplified - all motors have detachable plugs, endstops are push fit. this allows for a wiring loom to be used.
RAMPS electronics as standard with the Panelolu2 controller.
All the detail is available on our blog:
http://blog.think3dprint3d.com/2013/09/mendel90-laser-cut-ready-to-print.html
The assembly process in more detail in in this post:http://blog.think3dprint3d.com/2013/10/mendel90-lasercut-overview.html
The commissioning and calibration in outline is here:
http://blog.think3dprint3d.com/2013/10/mendel90-lasercut-calibration.html
The printer is designed from the start to take multiple bowden extruders as an alternative to a single direct drive extruder. Updates will follow!
ROSCO is a DIY hobbyist friendly almost plug and play Telepresence robot kit. The Arxterra software and website portal and control panel makes it possible to control the robot from anywhere via the internet. All you need is the printed robot, Arduino Uno, Adafruit motor shield, and a web enabled Android smart device.
Full instructions, software, control panel, and BOM available at Arxterra.com
Arxterra is about building telerobotic communities to bring people together and create a forum for ingenuity and artistic expression. The first step to creating a robotic community is to design open source, low cost robots and a cloud based eco-system in which they can live.
Our current design is our own RObot SCOut or Rosco which is based on the Android/Arduino platforms. This rover can be 3d printed and built for under $200 sans smart phone. A quick download of our Arxrobot app and you will be connected to our servers bringing you together with robots from all over the world to build, create, and explore.
Focus is converted so it uses HP C6602 inkjet cartridges. It is currently hooked up so it uses only one nozzle and prints with ordinary Gcode. As soon as I have more results, I will get the right slicers and firmware to print more like a printer, but for now this will do.
It prints with Zcorp powder and binder. This works by printing with binder (water, alcohol and glue) in Powder (glorified gypsum) to make a model. This model is then cleaned and impregnated with CA glue to make the model strong. It works great, but since a new layer currently takes 30 seconds to deposit and I print with only one nozzle, even small things take forever. The maoi is 40 minutes, the creeper 30 minutes. Plans are already being made to make a new printer specially for 3DP powder printing that is at least 30 times faster, but this will take several more months.
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| 3DP printhead with HP inkjet cartridge |
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| 3DP print results |
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| 3DP 3d printer |
- Aluminum composite shell body - did you notice how a simple cardboard box is rigid while assembled - same principal
- closed chamber - after installing front shield
- 15x15x15cm working volume
- 25x35cm footprint - plus Z contraption
- yegahD extruder
- single head or multiple with bowden
- nema23 for Y and n17 for other axes by default
- 12mm glides - uniform, stainless, aluminum or just some cold forged pipe.
- slide linear bearings
- bended aluminum single piece Xcart
- only ca. 200g of printed parts
- enclosed PSU and electronics - single ATX and Sunbeam/Teensylu in this case
- plywood and molded versions to come
- parametric openSCAD design
- ultra easy to correctly assemble and cheap to build
