@mnementh The closest one is the small knob TBH but as bd139 said it would need to be white as the closest colour to the original. It also turns out that the knob for the TDS220 (file bd139 found) is printable according to the 3dhubs.com and there is a print centre in Chelmsford and they can print it in white, @50 microns and have it ready in 2 days apparently for £4.25 a knob?
50 microns is excellent. You should get better results than I did, especially if the GCode they generate from the STL and their printer has been tweaked by an experienced user, not a total noob like me. Good price too, as you're getting ~20-30 minutes of gcode & printer prep, and 30-50 minutes printer time.
Sorry, but what I have on hand is black, silver and purple. Like I said, it was more a matter of letting you see what could be done, and seeing if my fix for the platen moving works.
I'm sure it won't go to waste... and even if it does, it was like 10¢ worth of filament.
You'll want to take a knob with you & match up the color in person; most every filament maker has the same shade of "Pure white" or "Titanium white"; however, the shades of off-white like you'll want vary greatly, and many are somewhat translucent.
Any variety of SLA will be much better finish, but will be somewhat translucent. You can get that easily from Shapeways if you want to pay their prices.
The ones I printed to show you are VERY serviceable, and have a good feel under your hand. What you get from your 3DP center should be better.
Cheers,
mnem
*Printer-friendly*