ToyREP Power Supply Cover

by thorgal, published

ToyREP Power Supply Cover by thorgal Jul 29, 2015
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This is an upgrade for ToyREP 3D Printer, that will allow you to attach LED power supply under the Y axis, so it is a solid part of the printer.

Cover is now available for two sizes. Use ToyREP-PSU1 for 111x78x36mm or ToyREP-PSU2 for 129x99x38mm. The instructions are the same for both.

It have a main power switch and covering all the dangerous connections to make the printer safer. As was already mentioned in the printer description, 40W 12V should be just enough for hotend and movement. For 100x100mm heat bed you will need approximately another 40W. That makes total 80W. I am currently using 75W PSU. It is sufficient for printing when heaters are already heated up and consuming less energy, but I have to be cautious and not switch heat bed and hotend at once.

The major disadvantage of this thing is, that PSU have to be installed at the very beginning of ToyREP assembly. For latter upgrade you will have to disassemble almost the whole printer.



  1. Printed cover - 1 pc
  2. Main power supply cable -1 pc (for eg. 1,5m long PC power cable)
  3. Power switch -1 pc (rated 250V 1A, for mounting hole 13x19mm)
  4. DC cable - 250mm piece (Two lines, distinguishable)
  5. Heatshrink - 100mm dia 5mm.
  6. Woodscreew 3x13 - 1pc
  7. Countersunk screew M3x6-8 - 3pcs
  8. Hexnut M8 - 1pc (additional to printer BoM)
  9. Washer M8 - 1pc (additional to printer BoM)


Pictures are for PSU1 version, but should be valid for PSU2 too.


Print the cover from enclosed file. Mine was made of ABS, 0.5mm noozle, 0.25mm thick layers. 2 outlines, 3 top and bottom layers, 30% hexagonal infill. Clean it and try to push M8 Rod through. Also try to install and remove the power switch from the cover.


If you are going to use PC power cable, just cut off the end with PC euro connector and keep the power socket plug. Cut off an other 150mm of cable for internal connections. Strip of the outer layer on the 150mm piece and keep just the blue and brown wires.
Remove insulation on the ends of the wires. One end should be a bit longer if you are going to turn it around the screws of PSU connectors.
Strip also the ends of the DC power cable that will lead from PSU to Ramps. This two line cable should have one cable with black and an other with red colour insulation.


Attach separate brown cable to the switch and cover the naked joint with a piece of heatshrink. If you have switch witch light, You will also have to connect the separate blue piece to the second circuit. Put power cable through round hole near the opening for power switch from outside to inside. Than take the naked ends out through the hole for power switch. Place heatshrink on cables that are going to be attached to switch. Solder brown and eventually blue cable to the remaining connectors on the switch.

Installing Wires

Connect yellow-green cable to earthing screw of the PSU. Place brown cable on L screw and blue on N screw. Install also two line cable. Red to V+ and black to V-. Put the 12V power cable from inside out through bottom round hole in the cover. Place the rod through the cover and bend wires around it. You can use zip ties, to clean the mess a bit.


Before you will close the PSU and install it into the printer, test if everything is running, and PSU is secure. Measure the output voltage and if needed adjust it to 12V with trimmer.


Place the cover over the connectors of PSU and tighten it atleast from one side with 3x13 wood screw.


With M3x6 or M3x8 countersunk screws tighten the PSU to the PCB1 and PCB2 part of the printer. Place these holders on the two X axis threaded rods, with washers and nuts and build the whole rest of the printer around it :D.


Be very careful when installing PSU as threaded rods may damage insulation on wires! If possible cover internal part of the threaded rod with duck tape.

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Hi Thorgal,

I've bought this PSU:

It's a little bigger at 130 x 98 x 42mm,
so I'm guessing I'll need to modify your PSU2 File?

Sorry if I sound dim, I have a friend that is going to print and send me the part, so I want to make sure it's right before I send the file,


Well, the PSU2 cover is for PSU 99mm wide and 38mm tall with hole 9mm from top and 2.75mm from the front edge of the side. It would probably do the job and cover everything dangerous, although You may have to live with the fact it have few milimeters offset.

I did not find any datasheet as there is no brand on the PSU and AD1210-120W is not good enough to google it, but if You bought the PSU already and want perfect fit, I would recommend to wait till it will arrive and measure it precisely.

Thanks Thorgal.

I've made and uploaded this in case anyone has the same size PSU: https://www.thingiverse.com/thing:2433354

I hope that's ok with you.

ToyREP-PSU 130 x 99 x 42
by Felyo

Perfectly OK. Added as an upgrade to ToyREP's main page. Thank You.

It have only two mounting holes on side (instead of three) so some adjustments will be required, but other that that it will work just fine.

Hum I see ! Ok thx ! This reptoy will be my next project... For sure
Thx !

One millimetre in description is usually not a big deal. Unfortunately there is no datasheet with distances of mounting holes, but it would definitely fit into the bigger version of the printer. It may happened that you will need different PCB2-1 and PCB2-2 parts, but that I can manage in few days.

I don´t have it. I just wanted to mention that, because you wrote that there isn´t a PSU with more than 75W in the required measurements.

I see. Thank you for reminding me. I found already even 120W LED PSU when people were asking for examples, but forgot to correct it.