CMD FD-2000/FD-4000 enclosure

This project is just what it says on the tin - a printable enclosure/case for the CMD FD-2000 and 4000 floppy drives for the Commodore 64/128.  Unlike my other CMD cases, I didn't model this one to replace a lost case, but rather to have the complete set for CMD's “big four” gadgets, and as a favor to an old friend. 🙂

I've tried to retain the look and shape of the original.  Like my RAMLink and CMD HD cases, this one has a little extender cap to place over the “swap” button.

This is a pretty big print - the top just BARELY fits on a 200x200 bed, with only a couple of millimeters to spare, so if you use a skirt or brim to prime the nozzle and your bed isn't at least a bit bigger than that, you'll have to turn those off and add some small object to one side, like a 20 x 20 x 0.2 mm box (or any other shape will do), and make sure it prints before the case does, so that it can do the skirt's job.

Important note:  like most of CMD's peripherals, the FD-2000 was originally designed around a metal case, and its 7805 regulator relies on the metal case for its heat sink.  If you do not sink the regulator, it will malfunction and the FD's electronics will freak-out.  Been there, done that. 🤣

This being a plastic case, I suggest securely fastening the regulator to the mainboard (it's a good idea to refresh its thermal compound while you're at it), and then affixing one of those stick-on 14x14x7 mm heat sinks commonly marketed for use on VGA chips, to the top of the regulator.  Since that corner of the mainboard would have normally been mounted via the regulator's hole, I've moved the mount over to the side and forward a bit, and positioned it so that a screw and washer will clamp the edge of the board to it.

My photos do not show this heat sink installed (nor is there a connection for the fan) because I actually borrowed the mainboard and other parts from my still-metal-cased FD-2000 for test fitting and photos.

The case top has a place to mount a 25 mm fan which, in concert with that stick-on heat sink, should keep the regulator happy.

To put everything together. you will need 13 M3 x 6 to 8 mm screws, four M3 x 14 mm screws (16 mm should be okay too), and nine nuts.  The screws you mount the mainboard to the case bottom with should be cap-head if possible, both for the sake of appearance and because the board mount threads are deliberately a bit tight and, at least for me, it's easier to get a good solid grip on cap-head screws with their larger Allen sockets.

All other screws should be pan-head or button-head.

The original case has 5 mm thick rubber feet, so for my print, I used four of those little stick-on “slider” feet (same ones as I use elsewhere).

When you put the case top on, you may find that the fan interferes slightly with the floppy drive's power wire/connector.  I was able to simply push it a little to the side.

All files are printable with the usual 0.2 mm layer height and 0.4-0.5 mm line width.

No supports are needed.

Pictured here is Atomic deep black PETG.

Stickers for front and back are included here, designed for makestickers.com.  If you would like to have them make some for you, try this link:

https://www.makestickers.com/design/25051415BVTP-6yx5kvcvbl95w8og79vjbn8q