3D Printing: Difference between revisions

All of Fat Cat Fab Lab's 3D printers were graciously donated or found. Special thanks to [https://www.mfgriffin.com/ Matt Griffin] of [https://ultimaker.com/ Ultimaker], 3D Hubs, [https://www.seemecnc.com/ SeeMeCNC], Emily Chapman, and [https://smooth.technology/ Smooth Technology]!!!

 

There is no certification to use these machines. However, our 3D Print 101 class is highly recommended for first time users.

 

 

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Members are encouraged to bring their own filaments for printing and store them in their bins when done. Below and above the main 3D printing table are various spools of 1.75mm and 2.85mm filament donated by others which are free to use. Any members who leave their spools out, by default, consents other members to use them at will.

 

Make sure build plate glass is clean and free of any oils or excessive glue stick by washing with warm water in the sink.

 

Certain high temp materials will stick strongly to glass and can crack it. For those, it's better to remove the prints before the glass cools fully to prevent this (ex: PC).

 

Ultimaker printers equipped with Olsson blocks can have their nozzles easily changed. Default for all applicable printers is 0.4mm (excludes Z-Unlimited). Please return printers back to 0.4mm after use or leave a note of what size nozzle is installed -- nozzle size indicators are on the printers for this purpose.

 

#Level the bed. Bed leveling required after a nozzle change since all nozzles are different heights based on aperture diameter and/or wear.

 

* 0.25mm - Greatest resolution, slowest speed.

* 0.4mm - Best balance of speed and resolution.

* 0.8mm - Fastest speed, lowest resolution.

 

 

Ultimaker nozzles are labeled with nozzle size and/or have dimples to indicate size. The following list only applies to Ultimaker brand nozzles. Other brands may use a different system.

* 0.8mm - 3 dimples.

 

Correct bed leveling is the most critical part to ensure successful print adhesion to bed. Adjust bed level and nozzle distance to thickness of Post-It paper (0.1mm). Dragging paper between bed and clean nozzle should have the pressure of "pencil on paper."

 

[https://support.ultimaker.com/hc/en-us/articles/360011848060-Bed-leveling-for-the-Ultimaker-2 Ultimaker Instructions]

 

[https://ultimaker.com/software/ultimaker-cura Ultimaker Cura] is recommended for slicing files. It's a free and open-source slicing software developed by Ultimaker and is compatible with a wide range of printers from other manufacturers to custom builds.

 

Watch the first layer or two before walking away from the printer. Check soon after that initial layers are adhering well before leaving printer alone.

 

* "3d Print Removal Tool" wood block. Slide along glass to knock print off glass.

* Scraper. Can be used to peel up edge of print. Good for prints using Brim or Raft.

* Tiny printed mallet. Similar to wood block for knocking print off glass.

 

For mechanical and electrical failures of the machines, please stop using the machine and notify the #3dprinting Slack channel with the issue.

 

The Feral Printer was found on the streets of Brooklyn. It's found a new home with us and has been modified into the [https://www.kickstarter.com/projects/1661525705/z-unlimited-add-on-for-ultimaker?ref=card XXL Z-Unlimited].

 

* Compatible Material Diameter = 2.85mm

 

* It's not recommended to print anything other than PLA in the machine because it has no heated bed.

* Make sure your filament does not have knots in the spool and that it is securely mounted on the spool holder.

* Pausing a job before the extruder has cleared the bed-clamps will cause a collision.

 

* Try to keep the print hollow with 0% infill for really tall parts. But if you need to add infill, you usually don’t need more than 10% infill since the nozzle is a much bigger size

 

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Some regular maintenance is required over time. Below are listed roughly in order by descending frequency of required maintenance/adjustment.

 

Nozzles should be kept as clean as possible for best results. Outer edges of nozzle tip can be cleaned by wiping with PLA while the nozzle is hot. Innards of nozzle should be cleaned whenever there is blockage.

 

All smooth rod axes should be and feel lightly oiled--never dry. Oil when nearly dry. Use light sewing machine oil. '''Never''' use grease! After oiling, with the printer off, move the print head slowly in circles across the full range of motion to distribute oil across rods. Don't forget to oil the smooth Z axis rods.

 

This doesn't need to be done often. When the Z axis leadscrew is dirty or needs regreasing, wipe the lead screw with a paper towel to remove old grease. Lead screw should be re-greased (green grease, Magnalube). Spread a few drops of grease along the length of the Z axis leadscrew travel. It helps to use the advanced settings to ask the printer to move the bed up and down the Z axis to work grease into the threads.

 

Belts should be taught. Loose belts will cause parts to be dimensionally inaccurate in one or more axes (X,Y). This can be viewed easily by printing a cylidrical shape with its axis in the Z-direction. Generally, the belts that need retightening will be the short belts from the X,Y motors. First pluck the belt and remember it's feel and sound. Loosen the 4 motor mount screws and push down on the top of the motor very hard as you retighten the screws in a star pattern. Pluck the belt and it should twang higher pitched when tightened.

 

 

 

[[Category:Lab Areas]]