regards Joan

In the meantime, I got myself a MMU2S to possibly address some of these issues with PVA Support Material Interface Layers.

Obviously, I bought it before reading the Forums and the shit ton of complains people seem to have with it but my first two prints dabbling with lettering on the first two layers appeared to have worked fine - I will though replace the Prusa provided Filament Buffer with something else as it's not doing what it's supposed to do and also a Royal P.I.T.A. to work with - Especially in my Printers confined location >_<

Will probably have to look into other mods as well addressing possible issues with the F.I.N.D.A. Probe Hole getting clogged.

Thanks for the recommendations! I'll see what I can do with them =)

The PINDA actually ignores the hills and valley, instead sensing the inductive change caused by the metal underneath.

Posted by: Robin

The PINDA as said only works on the steel sheet its self. The powder coating is on top of that and cant be picked up as its not sensed by the inductive pick up (PINDA). 

Is there an echo in the room?  lol.

Before printing the P.I.N.D.A. recognizes the Mountains while during measuring the Caliper measures the Valleys?

The PINDA as said only works on the steel sheet its self. The powder coating is on top of that and cant be picked up as its not sensed by the inductive pick up (PINDA).  Prusa have done there best to produce as flat a power coating as possible but the power coating is not flat. Therefore you need to compensate for that.

I print on to a textured sheet which has a deeper hole pattern than the power coated sheets have so i have to set up to allow the extra filament to squeeze down into the bottom of the holes to create the pattern i need as a surface pattern. For any parts that i need to fit together i always us a flat PEI sheet.

This block of settings control how supports are built under an overhang: critical settings are interface layers and contact Z distance. In a perfect world the interface layer is a flat surface spaced contact-Z-distance below the below the part overhang.  Thus, as the nozzle begins printing the overhang, the extrusion will form a string starting at the closest edge of the overhang and will extend out, cooling, and droop until it hits the support interface. In some cases the extrusion has cooled enough to not adhere to the interface, other times it is still melt and welds quite well. And thus the troubles begin.

But you are correct that layer 1 - while set to 0.20 mm in slicer can be 0.1 to 0.3 mm due to layer 1 calibration, the value set during Live-Z adjustment.  Some schools say to set Live-Z so that layer 1 is 0.2 mm thick. Other schools say adjust Live-Z so parts stick.  It's a personal choice, and leaves a variability that must be considered when making parts that require mechanical accuracy.  I'd use a smooth sheet for such parts to maintain some degree of accuracy and confidence I could get 0.2 mm as intended.

Default support material uses 0.2 mm as the interface gap. This, droop will be - ta da - up to -0.2 mm.  This makes that section of the part 0.2 mm lower than designed.

By changing support settings, you can reduce the support clearance and regain part accuracy. Depending on surface, there are tricks to maintain accuracy and support removability... but I doubt there is a one-stop solution for all cases.

Its better to use a flat PEI build sheet if your after close tollerance pitting parts as you have

Generally speaking, I'd say that dimensions are on point except for the +0.1mm added to the 4mm Slider piece ( I'd argue that's good enough for a non-industrial FDM Printer? ) and in hindsight possibly caused by the uneven structure of the Powdercoated Springsteel Bed? Before printing the P.I.N.D.A. recognizes the Mountains while during measuring the Caliper measures the Valleys?

I haven't done any changes regarding support material ( other than enabling it ) or filament droop ( ?? )... How should I go about that to improve my situation?