Design Guidelines for 3D printing PA12 with SLS

	Walls Recommended wall thickness
	___________________________________________________________
Maximum part dimensions	Minimum thickness [mm]	Optimum thickness [mm]	Maximum thickness [mm]
100 x 100 x 100 mm	0.7	1.5 – 6.0	8.0
250 x 250 x 250 mm	1.0	2.0 – 8.0	10.0
		* Polishing not possible

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	Holes *Recommended hole diameter*
	___________________________________________________________
Maximum part dimensions	Minimum diameter [mm]		Optimum diameter [mm]	Accuracy diameter [mm]
100 x 100 x 100 mm	1.5		≥ 2.0	+ 0.10 – 0.30
250 x 250 x 250 mm	2.0		≥ 3.0	+ 0.10 – 0.30
		* valid for nominal sizes between 4 and 50

	Feature size *Recommended feature width*
	___________________________________________________________
Maximum part dimensions	Minimum width [mm]	Optimum width [mm]	Maximum width [mm]
100 x 100 x 100 mm	1.5	≥ 2.0	n/a
250 x 250 x 250 mm	2.0	≥ 3.0	n/a

	Channels *Recommended channel diameter* ___________________________________________________________
Maximum part dimensions	Minimum diameter [mm]	Optimum diameter [mm]	Maximum diameter [mm]
100 x 100 x 100 mm	2.5	≥ 4.0	n/a
250 x 250 x 250 mm	3.0	≥ 5.0	n/a

	Connecting parts: Moving *Recommended clearance between two moving parts* ___________________________________________________________
Maximum part dimensions	Minimum clearance [mm]		Optimum clearance [mm]	Maximum clearance [mm]
100 x 100 x 100 mm	0.3		0.5 – 0.6	n/a
250 x 250 x 250 mm	0.5		0.6 – 0.8	n/a
		* Printed separately		** Printed as one

	Connecting parts: Press fit Recommended clearance between two parts to obtain press fit
	___________________________________________________________
Maximum part dimensions		Minimum clearance [mm]
100 x 100 x 100 mm		0.1
250 x 250 x 250 mm		0.2

	Embossed or engraved details or text Recommended dimensions for features raised or recessed below the model surface _________________________________________________________________
Maximum part dimensions	Minimum feature width/height [mm]	Optimum feature width/height [mm]	Maximum font height [mm]
100 x 100 x 100 mm	0.5	1.0	5.0
250 x 250 x 250 mm	0.5	1.0	5.0

	Escape holes *Recommended hole diameter to ensure powder free hollow parts* __________________________________________________________________
Maximum part dimensions	Minimum diameter [mm]	Minimum amount of escape holes 2 2
100 x 100 x 100 mm	8.0
250 x 250 x 250 mm	8.0
	1. Maximum feature height to width ratio of 5:1 2. Maximum channel length = 100

	Tolerances Valid for nominal sizes above 10 mm _______________________________________________________________
Max part dimensions	Linear dimensions [mm]	Dimensions Z [mm]
100 x 100 x 100 mm	IT12 [ISO 286-1] or ±0.3% of the longest diagonal	+ 0.5% – 0.3%

250 x 250 x 250 mm	IT12 [ISO 286-1] or ±0.4% of the longest diagonal	+ 0.6% – 0.3%

Required data format

This printing technology uses an STL format

_____________________________________________________________

STL conversion

Linear dimensions [mm]

Angle tolerance [◦]

Export settings

0.01

10 -20

Nominal size (mm)		IT12 Standard tolerance values [mm]	IT13 Standard tolerance values [mm]
Above	Up to and including	IT12 Standard tolerance values [mm]	IT13 Standard tolerance values [mm]
–	3	n/a	n/a
3	6	0.12	0.18
6	10	0.15	0.22
10	18	0.18	0.27
18	30	0.21	0.33
30	50	0.25	0.39
50	80	0.30	0.46
80	120	0.35	0.54
120	180	0.40	0.63
180	250	0.46	0.72
250	315	0.52	0.81
315	400	0.57	0.89
400	500	0.63	0.97
500	630	0.70	1.10
630	800	0.80	1.25

To guarantee IT12 tolerances values, your design should meet the optimum values of the design guidelines. For parts that do not meet these values or are larger than 250x250x250mm, IT13 tolerance values can be expected.

For nominal values between 3 and 10 mm, tolerance values of line 10-18 mm are valid.

Tolerance values in z-direction may slightly differ due to z-growth (technology dependent).

This classification can be compared with ISO 2768-1:1990 for linear dimensions. For parts up to 250x250x250 mm classification ‘m’ will be valid for linear dimensions of 6 mm and larger. For bigger parts tolerance class ‘c’ will apply

All information in this datasheet is based on appropriate testing further details of which are available on request and is stated to the best of our knowledge and belief at the time of publication. It is presented apart from contractual obligations and does not constitute any guarantee or warranty express or implied of properties or of process or application possibilities in individual cases. The data are subject to change without notice as part of our continuous development and improvement processes.

The content of this datasheet may be subject to copyright restrictions. Quoted results are compiled from test data.

Design Guidelines for 3D printing PA12 with SLS

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