Staedtler Norris Digital EMR Teardown

My Staedtler Norris Digital has been broken for a few years now (EMR cartridge has fallen out and doesn’t work) and a Staedtler Norris Digital Jumbo rubber/eraser has also become unglued. So I’ve eventually decided to teardown the tip cartridge and compare it to the rubber/eraser one. The latter I have not brutalised as it still works.

Tip cartridge (with tip): 65mm

Tip cartridge (without tip): 63mm

Rubber/eraser cartridge (with rubber/eraser): 66mm


Tip assembly (no casing and sled with tip): 55mm

Tip assembly (no casing without tip, with sled): 51.75mm?

Tip assembly (no casing without tip and sled): 50.75mm?


Lower tip assembly (with tip): 31mm

Lower tip assembly (without tip): 28mm


PCB (upper tip assembly): 27.75mm? N.B. About 4mm inserts into the lower assembly

PCB sled: 28mm (29mm with tabs)


Contact point between lower tip assembly and PCB


Excess casing beyond end of PCB (while in casing): 10mm
Excess casing at tip: 1mm
Excess sled beyond end of PCB: 1mm

Staedtler tip: 19mm
‘Bulb/knob’ at top of cartridge (tip and rubber/eraser): 3mm


All Measurements - No Pictures

Tip cartridge (with tip): 65mm
Tip cartridge (without tip): 63mm
Rubber/eraser cartridge (with rubber/eraser): 66mm
Tip assembly (no casing with tip and sled): 56mm
Tip assembly (no casing and sled with tip): 55mm
Tip assembly (no casing without tip, with sled): 51.75mm?
Tip assembly (no casing without tip and sled): 50.75mm?
Lower tip assembly (with tip): 31mm
Lower tip assembly (without tip): 28mm
PCB (upper tip assembly): 27.75mm? N.B. About 4mm inserts into the lower assembly
PCB sled: 28mm (29mm with tabs)
Excess casing beyond end of PCB (while in casing): 10mm
Excess casing at tip: 1mm
Excess sled beyond end of PCB: 1mm
Staedtler tip: 19mm
‘Bulb/knob’ at top of cartridge (tip and rubber/eraser): 3mm


And as a treat for making it to the end, here’s a sneak peak at how the LAMY/Staedtler Frankenpen I’m working on is going.

All I can say is dam(n) German engineering! :angry: :de:

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Nice teardown. Impressive.

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Thanks!

It was broken so I thought I might as well, and I couldn’t find any other photos of the innards online.

I need a new cutting mat though as that is a disgrace. I accidently left it in a hot car and now it’s permanently warped. Plus stained with black paint. And superglue. And with notches in it where I accidently stabbed it…

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Has anyone else been tracking prices on these?

They’re out of stock just about everywhere, and prices have been creeping up — I’d really like to get a replacement black and yellow one (non-jumbo) as a third spare.

Wow, $82 used on Amazon. Temporary shortage or discontinuation I wonder. :vb-scratch:

Looks like places such as this still have new stock but I can’t vouch for them.

Good luck.

I can’t remember how much they were, but it doesn’t seem that much more. The Amazon price tracker I use says that they’ve remained about the same.

There’s the Chromebook version out there that is just the same in different colours.

And the Mitsubishi Hi-uni DIGITAL is the same, just in maroon.