I'm printing a large piece (300mm plus) that is tapered (ie: base is wider than the top). It has multple protrusions (like horizontal antennae and spikes) over the surface. These spikes will need supports. I've tried using Simplify 3D, and due to the tapered nature, some of the supports need to be placed on the objects surface, not just run from the bed. Additionally, some of the supports for the topmost spikes, need to be from the print bed all the way up to 300-350mm height. To avoid too much damage to the print surface when removing supports, I have them horizontally separated from the surface and I upped both the top and bottom vertical separation of the supports as well (not a huge amount, but enough to make them easier to detach). The entire print job is going to be around 120-150 hours I think. Printing PLA, heated bed with PEI surface, .12 layer height.
The problem - I kicked off the print yesterday and this morning I checked on it. The object itself has great adhesion to the bed and the surface quality and layer lines look great, but some of the really tall supports are already failing to stick to the bed, resulting in spaghetti. And this is only maybe 40-50mm in to the print.
My thoughts are:
Option 1 - reduce the vertical seperation from the base of the supports to improve attachment (at risk of damage to the objects surface - is there a way in S3D to dictate different seperation for bed supports and those which will touch the print?)
Option 2 - Implement a raft, to give the supports something better to stick to
Option 3 - Explore something like Meshmixer for a different kind of support? (I've only ever used those kinds of solid "vine-like" supports with DLP printing so I'm unsure how well they work with FDM)
Any advice or suggestions? (apologies for lack of pics, I'm at work and my Onedrive isnt syncing properly so all my pics are out of reach)
What machine you are using CR-10, build volume: 300 x 300 x 400
What plastic are you printing with: PLA (3D Fillies PLASteel)
What is your printing temps bed/hotend: bed 70, hot end 195
What firmware are you running stock/custom: stock fimrware
What slicer are you using: Simplify3D