To make the lamp you need to print the following:

Four-colour
4x Mondrian lamp frame
1x Mondrian lamp top
1x Mondrian lamp bottom
1x Mondrian lamp four-colour panes red
1x Mondrian lamp four-colour panes white
1x Mondrian lamp four-colour panes blue
1x Mondrian lamp four-colour panes yellow

Two-tone
4x Mondrian lamp frame
1x Mondrian lamp top
1x Mondrian lamp bottom
1x Mondrian lamp two-tone panes grey 1
1x Mondrian lamp two-tone panes grey 2
1x Mondrian lamp two-tone panes white 1
1x Mondrian lamp two-tone panes white 2

Monochrome
4x Mondrian lamp frame
1x Mondrian lamp top
1x Mondrian lamp bottom
1x Mondrian lamp monochrome panes 1
1x Mondrian lamp monochrome panes 2
1x Mondrian lamp monochrome panes 3

If you want to change the patterns and colours you can print the individual panes in the following quantities:
15x Mondrian lamp pane size 1
13x Mondrian lamp pane size 2
9x Mondrian lamp pane size 3
4x Mondrian lamp pane size 4
17x Mondrian lamp pane size 5
13x Mondrian lamp pane size 6

Printing
The frame components were printed in Prusament galaxy black PLA, but you could use any PLA. I printed on a textured PEI sheet using the default Prusament PLA profile in Prusaslicer modified to a bed temperature of 65° and no fan for better adhesion. For other printers use your default PLA profile with a 0.4mm nozzle, 0.2mm layer height. The finished height of the frames needs to be reasonably accurate so that they slot into the base and top correctly.

The coloured panes were printed in Basicfil PLA, but you could use any opaque PLA. I printed on a textured PEI sheet using the default Prusament PLA profile in Prusaslicer modified to a bed temperature of 65° and no fan for better adhesion. For other printers use your default PLA profile with a 0.4mm nozzle, 0.2mm layer height. I found Basicfil PLA good for the panes because it has just the right opacity for the required pane thickness and stiffness.

Lamp
You will need this USB lamp, widely available on the internet DZYDZR 3W USB LED LampThe lamp does generate a small amount of heat but I have tested it for many hours and there are no problems. Alternatively you can bundle a string of USB fairy lights inside but the effect is not so good due to the uneven distribution of light.

Assembly
Refer to the assembly pictures for the relevant colours and patterns for the sides (type 1 & 2) and the top frame.

Fit all the panes into the frames, they will need a firm press fit into the pockets on the inside faces of the frames. Make sure the corners are fully pressed in.

Fit the lamp into the pocket in the base and pass the cable through the slot at the back.

Fit the left and back frames into the slots in the base, and then fit the front and right, they should fit easily. Note the alignment of the coloured panes, this will ensure the stiffing bars on the inside corners overlap correctly.

fit the top frame over the front, back and side frames and gently press it down. It should fit easily.

Your Mondrian lamp is now finished, enjoy!

Sizing
The parts are dimensioned to fit together perfectly on my Stock Prusa Mini, but your filament brand may have different shrinkage properties so I would suggest printing a couple of individual coloured panes to test for fit before printing the full pane sets.

If you find the panes are too loose you can either increase the X & Y scaling or put a dab of superglue on the edges before fitting them. Take care to avoid getting glue on the visible faces.

If you find the panes are too tight you can reduce the X & Y scaling.