Table 3.

Time distribution on tasks during the working week for each facility based on information from the exposure diaries.

Task	A-PBF (n = 15)	B-VP (n = 10)	C-MJ (n = 5)	D-ME (n = 3)
	Time % (range)	Time % (range)	Time % (range)	Time % (range)
Prepare/start print	<1	1 (<1–4)	1 (<1–2)	2 (<1–5)
Remove printed object	<1	<1	1 (<1–2)	2 (1–2)
Post-processing	15 (<1–72)	2 (<1–11)	62 (52–82)	<1
Cleaning printer	4 (<1–21)	<1	6 (4–18)	<1
Other AM	7 (<1–34)	<1	<1	<1
Other	74 (18–97)	97 (88–100)	30 (9–43)	96 (92–98)

n, number of measurements included in the calculations. Time distribution on tasks over the working week for each facility was calculated based on all observations for all operators that week. The range reflects the individual time distributions spent on each tasks for each operator at the facility and was calculated per day. ‘Other’ is to a large extent office work but at D-ME also involved visiting production lines to discuss projects and future printing needs. ‘Other AM’ is work related to printing but outside of the other categories, e.g. cleaning room, refilling powder, and dyeing objects. Facility A—powder bed fusion (A-PBF), facility B—vat photopolymerization (B-VP), facility C—material jetting (C-MJ), and facility D—material extrusion (D-ME).