Search found 93 matches

by mhudson52
Wed Apr 25, 2018 3:18 pm
Forum: SALES
Topic: Sinclair ZX80 Computer / collectable item with 16k RAM adaptor On Ebay
Replies: 4
Views: 29

Re: Sinclair ZX80 Computer / collectable item with 16k RAM adaptor On Ebay

Was that RAM pack actually available at the time of the ZX80?
by mhudson52
Wed Apr 25, 2018 3:15 pm
Forum: Development
Topic: ZX Printer Belt
Replies: 80
Views: 5618

Re: ZX Printer Belt

That is great news, especially the fit of the teeth in the sprocket grooves. I couldn't have gotten them that close without the actual pieces you sent. As for not having the styli attached during your test, I would suspect that the printer doesn't know (or care) whether they are there or not. With t...
by mhudson52
Tue Apr 24, 2018 3:32 pm
Forum: Development
Topic: ZX Printer Belt
Replies: 80
Views: 5618

Re: ZX Printer Belt

Have you checked the fit of the PLA version on your printer? Hopefully there are no issues there with it being either too loose or too tight. I was wondering if you could do a test "print" without the styli on it to see how it will function during actual use. My 0.2 nozzles should arrive today and w...
by mhudson52
Sat Apr 21, 2018 8:46 pm
Forum: Development
Topic: ZX Printer Belt
Replies: 80
Views: 5618

Re: ZX Printer Belt

As long as you don't forget to change nozzle size and temp in your slicer and slow print speed down to 20-30 mms you should do OK. My Ninjaflex specifies 235c for the hot end. Bed temp is not critical, but I usually give my glass bed a squirt or two of cheap hair spray for good measure. Here is one ...
by mhudson52
Sat Apr 21, 2018 3:07 am
Forum: Development
Topic: ZX Printer Belt
Replies: 80
Views: 5618

Re: ZX Printer Belt

Printing the belt using PLA filament yielded excellent results using the .4mm nozzle. It is quite flexible with the belt being so thin (.5mm), but will need some testing to verify durability. Tried again with TPU (more flexible) filament with disappointing results. The belt itself turned out nearly ...
by mhudson52
Fri Apr 20, 2018 1:17 am
Forum: Development
Topic: ZX Printer Belt
Replies: 80
Views: 5618

Re: ZX Printer Belt

Last entry for the day. Here is the latest version with integrated stylus posts. Haven't printed yet, but feeling confident. May need to go to the .2mm nozzle.
ZX Printer belt with post.JPG
by mhudson52
Thu Apr 19, 2018 6:14 pm
Forum: Development
Topic: ZX Printer Belt
Replies: 80
Views: 5618

Re: ZX Printer Belt

Hey Paul, no problem my friend.

If anyone is interested, here is the .STL file without any stylus mounting provision. That will need to be done by hand I'm betting.
by mhudson52
Thu Apr 19, 2018 3:16 pm
Forum: Development
Topic: ZX Printer Belt
Replies: 80
Views: 5618

Re: ZX Printer Belt

Update on the printer belt. Yesterday I received the printer belt fragments that Francois was so generous to loan me and immediately got out my scanning electron microscope and calipers. I had no idea how insanely tiny the features were, but after repeated measuring I feel good about the accuracy of...
by mhudson52
Wed Apr 18, 2018 2:24 pm
Forum: Hardware
Topic: ZX80 3K Ram Pack memory
Replies: 37
Views: 1069

Re: ZX80 3K Ram Pack memory

Charlie, you beat me to it by 2 minutes! :lol:
by mhudson52
Wed Apr 18, 2018 3:01 am
Forum: Hardware
Topic: ZX80 3K Ram Pack memory
Replies: 37
Views: 1069

Re: ZX80 3K Ram Pack memory

You guys are really finding some awesome stuff. As for the mod that Moggy has unearthed, something different will probably have to done in this situation. The board design I am using is the one Marcus Brenner re-drew based on the original board. Charlie found a couple of errors that, when corrected,...