From NASA 3D

3D Printing/SOHO-2/README.txt

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+SOHO 3d print suggestions
+<EFBFBD>	No support required
+<EFBFBD>	STL files have been test printed at both 0.2mm and 0.1mm layer height
+<EFBFBD>	(Optional) For added print quality use support material for SOHO_Part3
+<EFBFBD>	ABS and PLA plastic filament have been tested successfully
+
+Assembly
+1.	Remove printed parts from print bed
+2.	Clean up parts as necessary. Some printers may deposit extra material for the first layer that may need to be removed.
+3.	Press fit SOHO_Part2 and SOHO_Part3. Use the two pins on the top of SOHO_Part2 as guides. Note, this should be a snug fit.
+4.	If available, find a small segment of extra 1.75mm filament. Else skip to Step 9.
+5.	Cut the 1.75mm filament into 4 small pieces around 10mm long.
+6.	Press these segments into each of the 4 holes on the bottom surface of SOHO_Part1.
+7.	Take SOHO_Part2 and match up the holes with the protruding filament in SOHO_Part1.
+8.	Press fit SOHO_Part1 and SOHO_Part2 together.
+9.	For extra support a dab of super glue can be used between SOHO_Part1 and SOHO_Part2