RyBot (my D-Bot)

thingiverse

First, I want to say this is just meant to be a reference to my particular build based off of the D-Bot design. I have a few parts I designed and people may be curious as to the choices others have made to upgrade their printer. It is not instructions on how to build it or my attempt to present a new “better” version of the D-Bot. I don’t know if my parts will work on your printer but just incase they might help someone I wanted to make them available and give credit to the designers who helped me through this build. Anyway, I started by figuring out my own cut list.I was planning to use a 300mm x 300mm heated bed so I wanted to be able to cover that. Looking over the D-Bot 300mm x 300mm cut list and taking into consideration that 2 x 500mm extrusions from Open Builds was the same price as 1 x 1000mm I figured I could go a little longer on the X/Y and a little shorter on the Z So, I decided I would let them do some of my cuts and left the X/Y/Z at 500mm. The image of a cut list is just an example I made. I didn’t actually write down the cuts as I was building my bot. Then I started scouring Thingiverse for upgrades and builds. I decided I wanted to use a Titan Aero and I already had the Titan and V.6 so I just needed the upgrade kit. I decided I was going to support the bed on all 4 corners and use a 3 lead screw design for the Z axis. I didn’t want the Z to be over constrained so I found some Oldhams for the bed to ride on. Now it’s a lot more stable so I could take the bed frame down to 2020 and gain back that 20mm of Z. I found a low profile stepper mount and designed the spacer to align the guide bearings with the Oldhams. I also designed the middle idler bracket on the Z that can be adjusted by moving the cross bar. I bought a 1524mm continuous belt and still kept everything well under the clearance needed for the Z guides to bottom out on the frame. I used 40 tooth pulleys on the lead screws and a 20 tooth pulley on the stepper for a 2:1 ratio. Up top I printed the stepper brackets with zip tie supports, the stepper covers, the angled LED bracket, the original rear idler brackets, the Re-D-Bot Y brackets, and of course the Re-X-Carriage for the Titan Aero. On the Re-X-Carriage I snipped out a corner of the front cover to give more clearance for the heater cartridge and thermistor wires. On the bed I designed the bracket for the glass to fit with the heated bed and cork. ~~I found some bed spring brackets for 2020~~, the Oldhams and the 3 wheeled guides for 2020. To accomodate a piezo sensor for the Z probe I removed the leveling springs and went to a steal bed support plate. For the electronics, I am running a Duet Wifi with the 10A 24V power supply on the left and the 12V buck converter in front to power 12V fans through the Duet. The 20A 24V power supply on the right is running through an external MOSFET to power the Keenovo 24V bed heater. I designed stand-offs for the Duet and MOSFET that gave 10mm clearance and allowed for a cover. I attached a 40mm fan to blow over and under the drivers on the Duet. From the X carriage, I extended the ~~Mini Differential IR Height~~ Precision Piezo Sensor, the fans, and thermistor with some CAT5 and alarm wire. I extended the heater cartridge with wire I clipped from an older heater cartridge. I also extended the stepper wires with alarm wire. I chose to use the sensorless homing feature of the Duet Wifi for X/Y end stops. I also designed some physical “end stops” to control the collision with the carriage. I found some feet I printed a part of and scaled down on the Z to leave the right amount of space for my Z stepper. Everything was printed with Inland brand "natural" PETG. The electronics ~~and the bed support~~ are cut from finished hardboard and the side walls are foam core. Thanks to all the original designers! D-Bot https://www.thingiverse.com/thing:1001065 3 wheeled 2020 Z guide https://www.thingiverse.com/thing:2357801 3 wheeled Y guide https://www.thingiverse.com/thing:1930200 Titan Aero X carriage https://www.thingiverse.com/thing:2590868 Oldham lead screw mounts https://www.thingiverse.com/thing:2449886 Z stepper mount https://www.thingiverse.com/thing:2676531 X/Y stepper mounts w/zip ties https://www.thingiverse.com/thing:2369292 Motor covers https://www.thingiverse.com/thing:2254713 Feet https://www.thingiverse.com/thing:1126329 Bed spring mounts https://www.thingiverse.com/thing:2471033 LED bracket https://www.thingiverse.com/thing:2284126 As an example of print quality, I attached pictures of Baby Groot (my fourth print on this machine). .15 layer height, 2/3 scale *Update: I added a belt tensioner and a version with looser tolerances that will accommodate belts with a twist in them too keep the toothed side of the belt from causing artifacts by riding on the smooth idlers. Also, a graphic showing how I twisted them. *Update: Added Re-X-Carriage Adjustable Mount for Mini Differential IR Height Sensor and the sensor carriage. Will need an M3 x 20 bolt, M3 nut, and a spring. These and the belt tensioners can also be found under remixes for the Re-X-Carriage. *Update 4/27: I have added a wiring harness support that I designed and a remix of the wires mount for the Re-X Carriage that is stronger. I also added remixes to fit a 27mm drilled piezo and the Universal PCB v2.x. The IR height sensor was not performing well with Printbite+ and piezos are just so cool.