Workbench Upgrades
Every workbench, the Engineering Workbench included, has 10 upgrade slots. Each upgrade fits once per workbench, so all 10 can be installed together.
Crafting a batch gets faster with every item already made in it: 25% less time per finished item, down to 25% of the normal time. Single crafts are not affected.
Players near the workbench get at least 100% comfort.
Armour crafted at the workbench gets 1 more armour insert slot, up to the item's maximum.
When crafting more than one, each finished item has a 10% chance of a free extra one.
Unlocks any tech tree blueprint without the nodes before it, for 2x the scrap. Each such unlock has a 25% chance to fail and use the scrap anyway.
The area in which the workbench counts as nearby is 2x as large.
Each craft refunds a random share of up to 10% of every ingredient into the upgrade's own storage.
The workbench gets more health (500 on Workbench Level 1, 500 on Level 2, 750 on Level 3, 500 on the Engineering Workbench) and takes 20% less explosive damage.
Tech tree unlocks cost 20% less scrap.
Crafts can give a surplus item where the recipe lists one. No current recipe lists a surplus item.