i want to know about 3d printer making real houses can anybody help me?

They appear to be similar to those high pressure concrete pumps used when transporting concrete up or over structures is necessary.

This is a glimpse at 11 different companies:
https://www.3dnatives.com/en/3d-printed-house-companies-120220184/

Or a little more detail about one in particular:
https://singularityhub.com/2018/03/18/this-3d-printed-house-goes-up-in-a-day-for-under-10000/#sm.000016qzx0jmsconwx011avqqqjak

3D printed houses are no more a dream and you can get them soon at very low costs.
Here are some of the links to inform you better about them:
• https://all3dp.com/2/how-much-does-a-3d-printed-house-cost-in-2018/
• https://www.bbc.com/news/technology-44709534
• https://www.theguardian.com/artanddesign/2018/jun/06/netherlands-to-build-worlds-first-habitable-3d-printed-houses
• https://singularityhub.com/2018/03/18/this-3d-printed-house-goes-up-in-a-day-for-under-10000/#sm.00000o5p0th4jffo3v2b7wf0oerl1

https://dqhs2boof183h.cloudfront.net/cache/catalog/geeetech-a10m/1-700x700.jpg