Light bar for the Prusa i3 MK2/MK3 in single light, dual light, and MMU2 compatible variants. Mounts attach to the hexagonal holes in the z-axis tops. Mounts are designed to fit 9x17mm aluminum u-channel and have a hollow interior that is used to route the wires down the back of the printer frame for a clean look. Mount also includes an opening to insert a power switch. LED strip can be powered by the printer power supply. Use a 12V (MK2) or 24V (MK3) LED strip depending on which printer you have.
See post-printing section for assembly instructions.
Purchase hardware kit here. If the kit is out of stock, check back in a few days.
0.4mm Nozzle, 0.2mm Layer height
Supports only required for single mount.
24V LED strip (MK3)
12V LED strip (MK2)
Heat shrink tubing
M3 Brass inserts
M3x5mm countersunk screws
2mm Hex key
Metal file (optional)
Pictures shown are for the dual light version. The single light version instructions are basically the same, just without the additional LED strip.
Cut the u-channel to 31cm and and check that it slides into the mount ends. Use a metal file to round off any sharp edges to make it slide in easier.
Cut the LED strip at the designated cutting areas to fit the u-channel.
Cut the wire to 90cm (36"). For 12V MK2 builds, cut it 120cm (48") as you will probably need to route the wire over to the printer power supply to tie into 12V. The MK3 can tie into 24V inside the electronics case.
For the dual mount cut an additional 45cm (18") wire.
Single Mount Hardware
Single Mount Wiring Diagram
Dual Mount Hardware
Dual Mount Wiring Diagram
Insert the wire into the left side mount. If you have trouble getting the wire through, feed through a thinner wire, solder the main wire to it, and use that to pull through the main wire.
If making the dual mount, feed the wire through the right side mount.
Pulling through the main wire
Left mount wire
Right mount wire
Power Switch Wiring
Cut the red wire for the power switch. Be careful when cutting not to also cut through the back wire insulation. Pull back the red wire and strip off the ends.
Solder the power switch to the red wires. If using heatshrink, place it over the wires before soldering the power switch.
Insert the power switch into the opening. Pull the wire on either end to remove any slack.
The power switch needs to be 10x15mm to fit in the provided opening.
LED Strip Wiring
Cut the wire so that there is about 5cm (2") sticking out the end of the mount. Strip the ends of the wires and solder them to your LED strip. If using heat shrink, make sure to place that over the LED strip first.
If making the dual mount, connect the second LED strip according to the wiring diagram.
If you have a bench power supply, this is a good point to test that the LEDs and power switch are working before assembling everything.
Remove the adhesive cover from the LED strip and stick it to the inside of the u-channel.
Attach the cover to the u-channel and insert into the mounts. Fold the wire for easier insertion.
Brass Insert (Optional)
To help keep the light bar in place once installed on the printer, brass inserts can be installed into the studs that go through the z-axis tops. Once the light bar is on the printer, screw the caps into the brass inserts to hold it in place.
Using a soldering iron, heat up the brass insert and slowly push it down into the stud.
Glue the hexagonal stud into the mount. Regular super glue will work.
There are corresponding caps for the left and right side mounts that fit underneath the z-axis tops. The caps will not interfere with the ability of the printer to reach its full z-axis
Install the light bar onto the printer and route the wire down the back of the frame into the electronics case. There is a small opening near the hinge that the wire can fit through without any modifications. Cut the wire to length and strip off the ends to attach to your power source.
If using the brass inserts, screw in the caps on the underside of the z-axis tops.
To power the LED strip with the MK3 printer power supply, connect the power and ground wires to the first and second screw terminals on the EINSY board. The LED strips only consume 2.5W (single) and 5W (dual), so it won't put much excess load on the power supply.
The MK2 boards don't have a good place to tie into 12V, so your best option is probably to route the wire underneath the printer over to the power supply and tie in there.
Prusa i3 MK3 power supply connection (24V LED strips only)