as you have your heater exposed, what hole size do you think the mesh is?
On my side, about the 2ZM, I have no idea because I haven't disassembled it (but I'm thinking of asking for a DIY 2ZM to replace the 4Mi and make a few modifications on this (like 21700 and the wiring under the heater (like a Milaana))), but I've done some research with the heater on my RBT Milaana 3 and I'm pretty sure it's this (on McMaster-Carr):
[Stainless Steel Wire Cloth] - [304 Stainless Steel]:
Part Number:
85385T92
Wire Dia.:
0.0055" -> 0.1397mm
Opening Size:
0.018" -> 0.4572mm
Open Area:
59%
Mesh Size:
42 x 42
Width:
0.546" -> 13.8684mm (23 opening size for 24 wire)
Length:
To be determined!
Or this one:
[High-Volume Particle-Filtering Stainless Steel Wire Cloth] - [316 Stainless Steel]:
Part Number:
9230T58
Wire Dia.:
0.0055" -> 0.1397mm
Opening Size:
0.0183" -> 0.46482mm
Open Area:
59%
Mesh Size:
42 x 42
Width:
0.5529" -> 14.04366mm (23 opening size for 24 wire)
Length:
To be determined!
My caliper indicates correctly the ⌀0.13mm wire. About the opening size, I've tried inserting a ⌀0.4mm wire in it and it leaves a gap. I made the same test with a ⌀0.5mm wire and it doesn't fit. It is therefore highly likely that the opening size will be ~0.45mm, as in previous specifications (according to my research, these are the only two sizes available with these specifications on McMaster-Carr).
I wanted to order a sample to compare them and be completely sure, but unfortunately McMaster-Carr recently changed its conditions and now refuses to sell to any customer outside the United States. Ryan (ironically, that's the name of the person I conversed with at McMaster-Carr) told me he had adopt a “conservative” approach

However, the product seems to be imported from the People's Republic of China and I will do some research on this subject to find an identical mesh supplier in China (I'd like to design my DIY 4Mi

).
Please don't hesitate to share your ideas and creations with us!
