Friends - Please see this belt mounting strategy on a modified Prusa i3 Extruder Carriage. We are printing the extruder carriage as a 2 piece clamshell. See picture at Here's the embedded picture: Design Rationale for Belt Mounting: 1. Removable plug is used to fix belt into place. No clips or zip ties needed 2. One side is fixed first with first plug. 3. Then the second side belt is wovby marcin_ose - Developers
MechaBits - this is good, thank you. Would you mind showing a picture of your machine, including label 1-48 for the parts? That sounds like a really good count. Please see our update on the design - Thanks, Marcin and Michelby marcin_ose - Developers
Ok, decent point, but now let's get more rigorous. Count the unique parts for the delta, down to individual nuts etc - and compare to the cartesian. We'll do our count as soon as we finalize the design. Do you have a count for the Delta as a benchmark?by marcin_ose - Developers
Dear RepRap Community, Our goal is to design a scalable 3D printer with a minimum parts count. Here is our initial concept design (by Marcin Jakubowski and Michel Dhoore): It is based on the Prusa i3 x axis design. The same drive axis is used throughout. Who has tried this before? Does anyone see any issues as to why this may not work? Marcinby marcin_ose - Developers
It would be good to do experiments as proposed by Poli. We are taking applications from anyone qualified to collaborate on design and to run the required experimental procedures. We can consider a residency at OSE's facility to move this forward in 2015. If you are interested, please email me at marcin at opensourceecology dot org.by marcin_ose - Polymer Working Group
Friends, It has been long ago that we reported on our 3D printing adventures. We are pleased to report that our copy of RepRap Darwin has shown its first meaningful prints, thanks to our collaborator Peter Koeleman from the Netherlands: Marcinby marcin_ose - General
Perhaps this video may clear up some of our work - - hot off the press from our application to the Buckminster Fuller Challenge. On biofuel, our presentation on Reaching Post-Scarcity Escape Velocity has one figure on Energy 101 discussing feasibility of biomass pellets as fuel.by marcin_ose - RepLab Working Group
The solenoids are controlled successfully with the Omnifet Fully Autoprotected Power MOSFET, VNP35N07 - suggested by Chris. Here is a video of the solenoids in operation - . Thanks, guys.by marcin_ose - Controllers
Thanks a lot, Chris and everybody. I ordered the MOSFETs, and they are arriving Tuesday, and the problem should be fixed. I'll report on the results as soon as the circuits are tested with the solenoids.by marcin_ose - Controllers
I am using this MOSFET: and this diode: The control board looks like this after placing the diode in the correct location: The MOSFET has no signs of damage, it did not get hot, but fried right after the solenoid was turned on and off. The steady state amperage on the solenoid was measured at 3.7 amps. In real life,the solenoids are turned on and off for approximately 2 second intervals. Whenby marcin_ose - Controllers
We are using these MOSFETS: And these diodes: They are attached on the circuit board as shown here: I found that as soon as the solenoid was turned on and off, the MOSFET fried. There is no visible signs of damage or heating on the MOSFET, nor on the diode. The MOSFET, measured right on the circuit, is conducting between all leads after it failed. The diode appears to be working still -by marcin_ose - Controllers
I'm using the PWM driver board v1.1 from Makerbot in another project. I understand there's a bug in the board, and that the solution has been identified. Having the diode placement corrected, a picture of my board is shown here. We did replace the TIP 120 with a MOSFET, as documented also in the last link, so that we would avoid having to use a heatsink. Everything else on the board is accordiby marcin_ose - Controllers
RepTab, the open source torch table, a distant cousin of RepRap, has been featured in MAKE zine. Please check it out: http://openfarmtech.org/weblog/?p=1424 Thanks, Marcinby marcin_ose - RepLab Working Group